Box fob ammonia compression pumps



(No Model.) 2 Sheets-Sheet 1 J. A. OSENBRUGK.

STUFFING BOX FOR AMMONIA GOMPRESSION PUMPS.

Patnted June 24, 1884.

Sm llii\ l am- A is* w l W Fm o |11 (No Model.) 2 Sheets-Sheet 2.

J. A. OSENBRCK. STUFPING B0X FOR AMMONIA COMPRESSION PUMPS. No. 300,886.

PatentedJune 24, 1884.

. cape of ammonia from the machine.

Nrrnn STATES arnu'r trice.

sruF'FiNe-Box FOR AMMONIA CoMPREssloN-PUMPS.

SPECIFICATION forming part of Letters Patent 120.300,88, dated June 24, 1884.

Application tiled June 29, 1883. (No modele) Patented in Germany January 6, 1882, No.17,373, October 31, 1882, No. 21,378, and January 5, 1883, No. 21,971; in England February 27, 1882, No. 982; in France May 13, 1882, No. 147,683, and in Austria-Hungary May 25, 1882, No. 12,817 and N0. 20,241.

To all whom, it may concern'.-

Be it known that I, J oHANNns AUGUST OsnNBRcK, of Hemelingen, near Bremen, in the Empire of Germany, have invented certain new and useful Improvements in Stuffing Boxes for Ammonia Compression-Pumps, (for which Letters Patent have heretofore been granted to meby the government of Germany, No. 17,373, dated January 6, 1882, N o. 21,378, dated October 31, 1882, and No. 21,971, dated January 5, 1883; France, No. 147,683, dated May 13, 1882; Austria-Hungary, numbered, respectively, 12,817 and 20,241, dated May 25, 1882; and Great Britain, No. 982, dated February 27, 1882,) of which the following is a specification.

This invention relates to improvements in the stuffing-boxes for ammonia compressionpumps, and more especially to the compression-pump used in the Linde ice and refrigerating machine, in which glycerine is made use of as a liquid packing for preventing the es- As the glycerine is kept in said refrigerating-machine under the same pressure as the pump, it absorbs, owing to the high pressure and the comparatively low temperature, a considerable quantity of ammonia. In the Working of the pump some ofthe glycerine which has absorbed ammonia adheres to a portion of the pistonrod when the same leaves the stuffing-box, so that the glycerine emits some of its ammonia, owing to the difference of pressure at the interior of the pump and the atmosphere. Though at each stroke of the piston a very small quantity of ammonia only is emitted, gradually a perceptible loss of ammonia takes place in course of time, owing to the large number of strokes of the piston.

The object of this invention is to overcome.

this loss of ammonia and to furnish a stuffingboX for ammonia compression-pumps in which the defect is obviated; and the invention consists of the combination, with the piston-rod and stuffing-box of an ammonia compressionpump, of an oilchamber that is extended around the piston-rod and arranged with a heating device at the lower part for keeping the oil warm, a valved pipe connecting the upper part of the oil-chamber with the suction-pipe of the pump, and a second stuffingboX -by which the escape of oil from the oilchamber is prevented. y

In the accompanying drawings, Figure 1 represents a vertical longitudinal section of my improved stuffing-box for ammonia compression-pumps. Fig. 2 is an end elevation of the same, and Fig. 3 a vertical transverse section on line x x, Fig. 1.

Similar letters of reference indicate corresponding parts.

Ain the drawings represents a stuffing-box for the piston-rod of an ammonia compression pump. The stuffing-box is applied to the cylinder-head of the pump in the usual manner.

B is a rubber packing, that is placed around the sleeve b of an oil-chamber, D, and pressed tightly into the stufing-boXA by a lid, C, and screws a a, Which turn in a flange, a', of the oil-chamber D. By the packing B the escape of ammonia at the point where the stuffingbox A is connected to the oil-,chamber is prevented. The oil-chamber D is iilled with mineral oil neutral to ammonia-that is to say, which has no tendency to absorb ammonia-vapors. The oil-chamber D is provided at its opposite end with a stufngbox, E, through which the piston-rod `passes to the outside, as shown in Fig. 1. f

At the lower part ofthe oilchamber D a hollow cylinder, F, is arranged, into which a cylinder, F', is inserted, through the lid of` which passes a steam-induction pipe, 1, while the water of condensation is conducted oft' through a pipe, 2. The steam serves for the purpose of heating up the oil in the chamber D. The oilchamber D is provided with an oil-gage, D', (shown in Fig. 2,) by which the level of oil in the chamber is observed. Through the stop-cock 5 oil is forced from time to time into the oilchamber D, to replace the oil spent in the working of the pump. The upper part of the chamber D communicates by a pipe, 6, and socket 4 with the suction-pipe of the ammonia compression-cylinder, so that the oil which plays around the piston-rod of the pump is under the same pressure as the pump. The pressure-gage at the upper part of the oilchamber indicates the pressure in the same when the stop-cock 3 is opened.

By the heating device F the oil in the oilchamber D is heated to such a temperature that it cannot absorb any ammonia-vapors. It is thereby absolutely, neutral against these vapors. The ammonia-vapors which escape through the stuffing-box A pass into the space G at the upper part of the oil-chamber7 and are conducted from thence through the pipef to the suction-pipe and sucked off by the same. As the piston-rod ofthe pump passes through the hot oil7 which forms a liquid packing for the same, and which is always free of ammonia, no vapors can therefore pass to the out side along the piston-rod, the hot oil forming an absolutely tight and reliable packing against the escape of ammonia-vapors, even at a compalatively low pressure.

Having, thus described my invention, I claim as new and desire to secure by Letters Patent- The combination, with the piston-rod and stuffing box of an ammonia compressionpump, ofan oil-chamber arranged around the pistonerod, a heating device at the lower part of the oilchamber for keeping the oil warm, a valved pipe connecting the upper part of the oil-chamber with the suction-pipe of the pump, and asecond stufng-box by which the escape of oil from the oil-chamber is prevented, substantially as set forth.

In testimony that I claim the foregoingv as my invention I have signed my name in the presence of two subscribing witnesses.

JOHANNES AUGUST OSENBRCK. Vitnessesr ADoLF OSENBRCK, CARL UHMEIDE. 

